Hermann von mitzlaff



(No Model.)

I-I. VON MITZLAFP. SLIDE VALVE Patented June 14, 1892.

y Mm@ MW v I lul! Avrna I Nrrnn STATES HERMANN VON MITZLAFF, OF BERLIN, GERMANY.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent N o. 477,088, dated J' une 14, 1892. Application tiled September 12., 1891. Serial No. 405,538. (No model.)

To @ZZ whom it may concern:

'Be it known that I, HERMANN vor.T Mirz- LAFF, asubject of the King of Prussia, residing at Berlin, in the Kingdom of Prussia and German Empire, have invented new and useful Improvements in Slide-Valves, of which the following is a specification.

The annexed drawings illustrate the packing forming the object of this invention applied to the movable piston of a piston-valve, which valve serves to regulate the inflow and outflow of the fluid under pressure from an accumulator or pump to one or more pressure-cylinders.

In the drawings, Figure l is a vertical central section of the valve.. Fig. 2 is a similar section as Fig. l, with parts in a dilferent position than in Fig. l. Fig. 3 is a section along a Z), Fig. l.

The inlet a communicates with a conduit (not shown) for the lluid under pressure. The outlets b b allow the fluid to enter the conduits leading to the operating receivers or vessels.

The discharge is indicated by c.

The piston consists of two parts or cylinders d d, connected by a stem or narrow portion c. The part d serves to shut olf the fluid from the out-lets b b, and the part t serves to close the discharge. When the piston is in the position shown in Fig. l, the fluid enters through inlet a and passes by the stem c to the outlets b b, and thence to the pointor points of use. When in the position shown in Fig. 2, the fluid passes off from the point of use through the outlets Z2 o" to the discharge c.

The packings p p are made in ring form and inserted into the valve-chamber. These packings are exposed to the pressure of the fluid by the following arrangement.

A hollow cylinder composed of two parts or sections ff and flanged at its upper and lower ends is inserted into the valve-chamber, the lower flange resting on the packing p, the upper flange supporting the packingp. The fluid entering through inlet a can pass into the interior of the hollow cylinder through an opening or openings g, formed, preferably, at the joint or seam of the two sections of the cylinder. The iluid entering under pressure into the interior of the hollow cylinder f f will tend to spread or separate the cylinder-sections and cause them to press on the packing-ringspp and spread the latter, so as to expand them against the pistons d d. If the pressure of fluid is so great that the packing might thereby be destroyed, the cylinder-sections ff can have their contiguous rims extended or reinforced by flanges, so that the pressure or rush of fluid to the packing is diminished as the eX- tent of the flange-like reinforcements is increased. lVhen in the position shown in Fig. l, the piston c closes the discharge c by means of the paekingp. The piston d" has an annular groove r, triangular in crossseetion, so as to form a rim 11, on which the packing-ring p rests. lVhen the fluid coming from inlet a past the stem e strikes the packing-ri ng 19', the latter is expanded, so as to be forced or spread against the wall of the chamber and effect a tight closure of the discharge c. If the packing 27 consists of a disk of rubber or leather, then the rim i may consist of a nut to facilitate the insertion of the packing. This nut can be screwed onto the stein c', which would be suitably th reade'd for this purpose; or the stem e', with the rim t', might be formed or cast as a separate piece and provided with a screw-stem for engaging a suitably-tapped hole in the body of the piston.

That I claim as new, and desire to secure by Letters Patent, is-

1. A valve having a sliding piston, in coinbination with paekings p p for said piston and hollow cylinder-sections f f, placed between said paekings, said cylinder-sections having flanges made t0 bear against the packings and being provided with an opening for the entrance of fluid into the sections to spread the latter, substantially as described.

2. A valve having a sliding piston, in combination with the packings pp for said piston and hollow cylinder-sections placed between the packings and made to bear against the latter by the pressure of the fluid, said piston having an undercut groove o' and a rim i, with a packing p" supported by said rim, substantiallyas described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

HERMANN VON MITZLAFF.

Witnesses:

W. HAUPT, A J. MoNoD vonT FnoIDEvILLnR.

IOO 

